Question

Shoppers enter Hamilton Place Mall at an average of 10 per five minute intervals (or 120...

Shoppers enter Hamilton Place Mall at an average of 10 per five minute intervals (or 120 per hour)

a. What is the probability that exactly 5 shoppers enter the mall between noon and
12:05 p.m.?

b. What is the probability that at least 2(i.e. 2 or more) shoppers enter the mall between 5:00 and 5:05 p.m.?

c. If the number of shoppers entering the mall in different hours are independent of one another, find the expected number of shoppers entering the mall between 9:00 am and 9:00 p.m.

Homework Answers

Answer #1

a)

between noon and 12:05 pm, time = 5 min

hence mean = 10

X follow poisson distribution

P(X = 5) = e^(-10) * 10^5/5!

= 0.0378

b)

again X follow poisson with mean = 10

P(X >= 2) = 1- P(X =0) - P(X = 1)

= 1- e^(-10)(1+10)

= 0.9995

c)

there are 12 hours b/w 9 am and 9 pm

hence

12 * 120

= 1440

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